Re: grep - serach limited to complete word only

Thank you for all of you who reply this question. :)

One more question on the word boundary: I read the documentation and the document said,

"is a spot between two characters that has a \w on one side of it and a \W on the other side of it (in either order), counting the imaginary characters off the beginning and end of the string as matching a \W "

Can I said the word boundary is any character in class \w?(e,g, space, tab, newline?)

Comment on Re: grep - serach limited to complete word only

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Re^2: grep - serach limited to complete word only by Not_a_Number (Prior) on Mar 30, 2008 at 14:49 UTC
Can I said the word boundary is any character in class \w?(e,g, space, tab, newline?) Not really, no. To illustrate the difference: `my $string = 'run rabbit run'; print "Matched with word boundary\n" if $string =~ /\brun\b/; print "Matched with non-word char\n" if $string =~ /\Wrun\W/;` [download] Update: I (and the above code) assume you meant 'class `\W`' rather than 'class `\w`.' If you meant 'class `\s`', the answer is the same: `print "Matched with whitespace\n" if $string =~ /\srun\s/;`	[reply] [d/l] [select]
Re^2: grep - serach limited to complete word only by jwkrahn (Abbot) on Mar 30, 2008 at 15:31 UTC
The `\w` character class does not include space, tab or newline. The `\w` character class is comprised of letters, numbers and `'_'` the underscore character. Also, the `\b` word boundary does not match a character, it is a zero-width assertion, it matches between characters.	[reply] [d/l] [select]